diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/build.gradle.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/build.gradle.mustache
index 16ba819b9739..f7374e37e164 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/build.gradle.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/build.gradle.mustache
@@ -142,7 +142,7 @@ ext {
     {{/openApiNullable}}
     {{/useJackson3}}
     jakarta_annotation_version = "1.3.5"
-    httpclient_version = "5.1.3"
+    httpclient_version = "5.6.3"
     jodatime_version = "2.9.9"
     junit_version = "5.10.2"
 }
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/pom.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/pom.mustache
index b7c8bb426d62..254a945b543f 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/apache-httpclient/pom.mustache
@@ -391,7 +391,7 @@
         {{#swagger2AnnotationLibrary}}
         <swagger-annotations-version>2.2.15</swagger-annotations-version>
         {{/swagger2AnnotationLibrary}}
-        <httpclient-version>5.2.1</httpclient-version>
+        <httpclient-version>5.6.3</httpclient-version>
         {{^useJackson3}}
         <jackson-version>2.21.5</jackson-version>
         <jackson-annotations-version>2.21</jackson-annotations-version>
diff --git a/samples/client/echo_api/java/apache-httpclient/build.gradle b/samples/client/echo_api/java/apache-httpclient/build.gradle
index b529040ea55d..bf7abfef0000 100644
--- a/samples/client/echo_api/java/apache-httpclient/build.gradle
+++ b/samples/client/echo_api/java/apache-httpclient/build.gradle
@@ -125,7 +125,7 @@ ext {
     jackson_databind_version = "2.21.5"
     jackson_databind_nullable_version = "0.2.11"
     jakarta_annotation_version = "1.3.5"
-    httpclient_version = "5.1.3"
+    httpclient_version = "5.6.3"
     jodatime_version = "2.9.9"
     junit_version = "5.10.2"
 }
diff --git a/samples/client/echo_api/java/apache-httpclient/pom.xml b/samples/client/echo_api/java/apache-httpclient/pom.xml
index 9e22fad3cc39..d23dd03c94d0 100644
--- a/samples/client/echo_api/java/apache-httpclient/pom.xml
+++ b/samples/client/echo_api/java/apache-httpclient/pom.xml
@@ -269,7 +269,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <httpclient-version>5.2.1</httpclient-version>
+        <httpclient-version>5.6.3</httpclient-version>
         <jackson-version>2.21.5</jackson-version>
         <jackson-annotations-version>2.21</jackson-annotations-version>
         <jackson-databind-version>2.21.5</jackson-databind-version>
diff --git a/samples/client/petstore/java/apache-httpclient-jackson3/build.gradle b/samples/client/petstore/java/apache-httpclient-jackson3/build.gradle
index 8810c9002fa6..1a0fae43b234 100644
--- a/samples/client/petstore/java/apache-httpclient-jackson3/build.gradle
+++ b/samples/client/petstore/java/apache-httpclient-jackson3/build.gradle
@@ -124,7 +124,7 @@ ext {
     jackson_annotations_version = "2.21"
     jackson_databind_nullable_version = "0.2.11"
     jakarta_annotation_version = "1.3.5"
-    httpclient_version = "5.1.3"
+    httpclient_version = "5.6.3"
     jodatime_version = "2.9.9"
     junit_version = "5.10.2"
 }
diff --git a/samples/client/petstore/java/apache-httpclient-jackson3/pom.xml b/samples/client/petstore/java/apache-httpclient-jackson3/pom.xml
index 7a7eaccd9d5e..b1abe03dd924 100644
--- a/samples/client/petstore/java/apache-httpclient-jackson3/pom.xml
+++ b/samples/client/petstore/java/apache-httpclient-jackson3/pom.xml
@@ -265,7 +265,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <httpclient-version>5.2.1</httpclient-version>
+        <httpclient-version>5.6.3</httpclient-version>
         <jackson3-version>3.1.5</jackson3-version>
         <jackson-annotations-version>2.21</jackson-annotations-version>
         <jackson-databind-nullable-version>0.2.11</jackson-databind-nullable-version>
diff --git a/samples/client/petstore/java/apache-httpclient/build.gradle b/samples/client/petstore/java/apache-httpclient/build.gradle
index cb47bb9d943a..5747befa6389 100644
--- a/samples/client/petstore/java/apache-httpclient/build.gradle
+++ b/samples/client/petstore/java/apache-httpclient/build.gradle
@@ -125,7 +125,7 @@ ext {
     jackson_databind_version = "2.21.5"
     jackson_databind_nullable_version = "0.2.11"
     jakarta_annotation_version = "1.3.5"
-    httpclient_version = "5.1.3"
+    httpclient_version = "5.6.3"
     jodatime_version = "2.9.9"
     junit_version = "5.10.2"
 }
diff --git a/samples/client/petstore/java/apache-httpclient/pom.xml b/samples/client/petstore/java/apache-httpclient/pom.xml
index 155df5c41399..f8cfdad62018 100644
--- a/samples/client/petstore/java/apache-httpclient/pom.xml
+++ b/samples/client/petstore/java/apache-httpclient/pom.xml
@@ -269,7 +269,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <httpclient-version>5.2.1</httpclient-version>
+        <httpclient-version>5.6.3</httpclient-version>
         <jackson-version>2.21.5</jackson-version>
         <jackson-annotations-version>2.21</jackson-annotations-version>
         <jackson-databind-version>2.21.5</jackson-databind-version>